The description is just a placeholder period, but combined with the object name HitLess, a common term in radio-protection terminology for switchover without traffic interruption, and the enumeration of off, left, right, self, mate, this almost certainly locks a protected radio pair's active/standby switching mechanism to force traffic onto a specific side rather than letting automatic protection switching decide. A technician about to service the mate unit in a 1+1 protected pair would lock switching to self first, so the protection logic doesn't attempt a hitless switchover mid-maintenance and disrupt the technician's work. Leaving this at off(2) during normal operation allows the automatic protection switching to choose the active side based on link quality as designed.